Party rule, for short

• Quartet often near RSVP
• Party request: abbr
• Letters of invitation?
• Party letters
• Invite letters
• Letters on a party invitation indicating that booze won't be provided by the host
• "No alcohol provided" letters
• Party abbr. about drinks
• Abbr. on some invitations

Wikipedia Word definitions in Wikipedia
BYOB is an initialism used on party invitations, meaning "bring your own beverage" or variants. BYOB may also refer to: BYOB (musician) , an English musician B.Y.O.B. (song) , a song by System of a Down from their album Mezmerize BYOB (programming language) ...